Websites or services that claim to offer a "Confidential Informant Number Lookup" or a "Snitch List" for a fee are almost always scams. These sites typically:

Defense lawyers can file a specific motion asking the judge to unmask the informant. This is a high bar to clear. Judges are often hesitant to grant these motions unless it is absolutely necessary for a fair trial.

Unlike undercover police officers, CIs are usually private citizens—often involved in the criminal lifestyle themselves—who have agreed to cooperate with the police.

If criminals could look up CI numbers and cross-reference them with leaked or stolen data, they could identify, target, and harm informants—and their families. Informant homicides, while rare, have occurred after identity exposure.